Repeatedly getting verification texts, now i’ve received a suicide prevention one.

27F**,** I’ve been on a course for the past five months with two girls (19–22) who have made me increasingly uncomfortable. They regularly laugh to each other when I speak, stare at me, turn around to look at me, and make faces at each other when I’m talking or doing something in class.

Not long after starting the course, I began receiving verification texts for things I had never signed up for. I’ve received 15 in total, and I told my course tutor about the verification texts when they first started. The tutor had created a WhatsApp group for the course, so everyone had access to each other’s phone numbers.

I’ve also raised the girls’ behaviour with my tutor twice. She rearranged the seating, but they now just turn around in their chairs to look at me. I generally get along with most people in the class, but two girls I previously got along with have also suddenly become distant, so I’ve wondered whether there has been gossip about me.
Today, I received an unsolicited suicide prevention/crisis-support text message from an Irish service. It encouraged me to seek help if I was considering suicide and listed several crisis helplines. I looked into the number it came from and found that the service allows someone who is concerned about another person to request crisis information to be sent directly to their phone.
This made me wonder whether someone could have deliberately entered my number. Given the previous 15 verification texts and everything happening in the class, I’m suspicious, but I have no proof that these girls are responsible and don’t want to accuse anyone unfairly.
Has anyone experienced something similar? Can someone deliberately enter another person’s number into verification or suicide prevention/crisis-support services as a form of harassment, and is there any way to find out who triggered the messages?